# Copyright 2016 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from distutils import cygwinccompiler
from distutils import extension
from distutils import util
import errno
import os
import os.path
import pkg_resources
import platform
import re
import shlex
import shutil
import sys
import sysconfig

import setuptools
from setuptools.command import build_ext

# TODO(atash) add flag to disable Cython use

os.chdir(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, os.path.abspath('.'))

import protoc_lib_deps
import grpc_version

CLASSIFIERS = [
    'Development Status :: 5 - Production/Stable',
    'Programming Language :: Python',
    'Programming Language :: Python :: 2',
    'Programming Language :: Python :: 2.7',
    'Programming Language :: Python :: 3',
    'Programming Language :: Python :: 3.4',
    'Programming Language :: Python :: 3.5',
    'Programming Language :: Python :: 3.6',
    'License :: OSI Approved :: Apache Software License',
],

PY3 = sys.version_info.major == 3

# Environment variable to determine whether or not the Cython extension should
# *use* Cython or use the generated C files. Note that this requires the C files
# to have been generated by building first *with* Cython support.
BUILD_WITH_CYTHON = os.environ.get('GRPC_PYTHON_BUILD_WITH_CYTHON', False)

# There are some situations (like on Windows) where CC, CFLAGS, and LDFLAGS are
# entirely ignored/dropped/forgotten by distutils and its Cygwin/MinGW support.
# We use these environment variables to thus get around that without locking
# ourselves in w.r.t. the multitude of operating systems this ought to build on.
# We can also use these variables as a way to inject environment-specific
# compiler/linker flags. We assume GCC-like compilers and/or MinGW as a
# reasonable default.
EXTRA_ENV_COMPILE_ARGS = os.environ.get('GRPC_PYTHON_CFLAGS', None)
EXTRA_ENV_LINK_ARGS = os.environ.get('GRPC_PYTHON_LDFLAGS', None)
if EXTRA_ENV_COMPILE_ARGS is None:
  EXTRA_ENV_COMPILE_ARGS = '-std=c++11'
  if 'win32' in sys.platform:
    if sys.version_info < (3, 5):
      # We use define flags here and don't directly add to DEFINE_MACROS below to
      # ensure that the expert user/builder has a way of turning it off (via the
      # envvars) without adding yet more GRPC-specific envvars.
      # See https://sourceforge.net/p/mingw-w64/bugs/363/
      if '32' in platform.architecture()[0]:
        EXTRA_ENV_COMPILE_ARGS += ' -D_ftime=_ftime32 -D_timeb=__timeb32 -D_ftime_s=_ftime32_s -D_hypot=hypot'
      else:
        EXTRA_ENV_COMPILE_ARGS += ' -D_ftime=_ftime64 -D_timeb=__timeb64 -D_hypot=hypot'
    else:
      # We need to statically link the C++ Runtime, only the C runtime is
      # available dynamically
      EXTRA_ENV_COMPILE_ARGS += ' /MT'
  elif "linux" in sys.platform or "darwin" in sys.platform:
    EXTRA_ENV_COMPILE_ARGS += ' -fno-wrapv -frtti'
if EXTRA_ENV_LINK_ARGS is None:
  EXTRA_ENV_LINK_ARGS = ''
  if "linux" in sys.platform or "darwin" in sys.platform:
    EXTRA_ENV_LINK_ARGS += ' -lpthread'
  elif "win32" in sys.platform and sys.version_info < (3, 5):
    msvcr = cygwinccompiler.get_msvcr()[0]
    # TODO(atash) sift through the GCC specs to see if libstdc++ can have any
    # influence on the linkage outcome on MinGW for non-C++ programs.
    EXTRA_ENV_LINK_ARGS += (
        ' -static-libgcc -static-libstdc++ -mcrtdll={msvcr} '
        '-static'.format(msvcr=msvcr))

EXTRA_COMPILE_ARGS = shlex.split(EXTRA_ENV_COMPILE_ARGS)
EXTRA_LINK_ARGS = shlex.split(EXTRA_ENV_LINK_ARGS)

CC_FILES = [
  os.path.normpath(cc_file) for cc_file in protoc_lib_deps.CC_FILES]
PROTO_FILES = [
  os.path.normpath(proto_file) for proto_file in protoc_lib_deps.PROTO_FILES]
CC_INCLUDE = os.path.normpath(protoc_lib_deps.CC_INCLUDE)
PROTO_INCLUDE = os.path.normpath(protoc_lib_deps.PROTO_INCLUDE)

GRPC_PYTHON_TOOLS_PACKAGE = 'grpc_tools'
GRPC_PYTHON_PROTO_RESOURCES_NAME = '_proto'

DEFINE_MACROS = ()
if "win32" in sys.platform:
  DEFINE_MACROS += (('WIN32_LEAN_AND_MEAN', 1),)
  if '64bit' in platform.architecture()[0]:
    DEFINE_MACROS += (('MS_WIN64', 1),)
elif "linux" in sys.platform or "darwin" in sys.platform:
  DEFINE_MACROS += (('HAVE_PTHREAD', 1),)

# By default, Python3 distutils enforces compatibility of
# c plugins (.so files) with the OSX version Python3 was built with.
# For Python3.4, this is OSX 10.6, but we need Thread Local Support (__thread)
if 'darwin' in sys.platform and PY3:
  mac_target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
  if mac_target and (pkg_resources.parse_version(mac_target) <
		     pkg_resources.parse_version('10.9.0')):
    os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.9'
    os.environ['_PYTHON_HOST_PLATFORM'] = re.sub(
        r'macosx-[0-9]+\.[0-9]+-(.+)',
        r'macosx-10.9-\1',
        util.get_platform())

def package_data():
  tools_path = GRPC_PYTHON_TOOLS_PACKAGE.replace('.', os.path.sep)
  proto_resources_path = os.path.join(tools_path,
                                      GRPC_PYTHON_PROTO_RESOURCES_NAME)
  proto_files = []
  for proto_file in PROTO_FILES:
    source = os.path.join(PROTO_INCLUDE, proto_file)
    target = os.path.join(proto_resources_path, proto_file)
    relative_target = os.path.join(GRPC_PYTHON_PROTO_RESOURCES_NAME, proto_file)
    try:
      os.makedirs(os.path.dirname(target))
    except OSError as error:
      if error.errno == errno.EEXIST:
        pass
      else:
        raise
    shutil.copy(source, target)
    proto_files.append(relative_target)
  return {GRPC_PYTHON_TOOLS_PACKAGE: proto_files}

def extension_modules():
  if BUILD_WITH_CYTHON:
    plugin_sources = [os.path.join('grpc_tools', '_protoc_compiler.pyx')]
  else:
    plugin_sources = [os.path.join('grpc_tools', '_protoc_compiler.cpp')]

  plugin_sources += [
    os.path.join('grpc_tools', 'main.cc'),
    os.path.join('grpc_root', 'src', 'compiler', 'python_generator.cc')]

  #HACK: Substitute the embed.cc, which is a JS to C++
  #      preprocessor with the generated code.
  #      The generated code should not be material
  #      to the parts of protoc we use (it affects
  #      the JavaScript code generator, supposedly),
  #      but we need to be cautious about it.
  cc_files_clone = list(CC_FILES)
  embed_cc_file = os.path.normpath('google/protobuf/compiler/js/embed.cc')
  well_known_types_file = os.path.normpath(
      'google/protobuf/compiler/js/well_known_types_embed.cc')
  if embed_cc_file in cc_files_clone:
    cc_files_clone.remove(embed_cc_file)
  if well_known_types_file in cc_files_clone:
    cc_files_clone.remove(well_known_types_file)
    plugin_sources += [os.path.join('grpc_tools', 'protobuf_generated_well_known_types_embed.cc')]
  plugin_sources += [os.path.join(CC_INCLUDE, cc_file) for cc_file in cc_files_clone]

  plugin_ext = extension.Extension(
      name='grpc_tools._protoc_compiler',
      sources=plugin_sources,
      include_dirs=[
          '.',
          'grpc_root',
          os.path.join('grpc_root', 'include'),
          CC_INCLUDE,
      ],
      language='c++',
      define_macros=list(DEFINE_MACROS),
      extra_compile_args=list(EXTRA_COMPILE_ARGS),
      extra_link_args=list(EXTRA_LINK_ARGS),
  )
  extensions = [plugin_ext]
  if BUILD_WITH_CYTHON:
    from Cython import Build
    return Build.cythonize(extensions)
  else:
    return extensions

setuptools.setup(
  name='grpcio-tools',
  version=grpc_version.VERSION,
  description='Protobuf code generator for gRPC',
  author='The gRPC Authors',
  author_email='grpc-io@googlegroups.com',
  url='https://grpc.io',
  license='Apache License 2.0',
  classifiers=CLASSIFIERS,
  ext_modules=extension_modules(),
  packages=setuptools.find_packages('.'),
  install_requires=[
    'protobuf>=3.3.0',
    'grpcio>={version}'.format(version=grpc_version.VERSION),
  ],
  package_data=package_data(),
)
